POWER AND RENEWABLE ENERGY
OVERVIEW, CHARACTERISTICS AND STATUS
Sector Status and Growth The state has seen a substantial growth in its population from 193 lakhs in 1901 to 721 lakhs in 2011. This substantial growth in population coupled with rapid urbanization and industrialization of the state has also resulted in a fairly steep growth in the electricity and energy demand for the state. In more recent times, the state’s electricity sector has seen a tremendous growth. The Naphtha based gas station of 10 MW capacity was commissioned at Narimanam during 1991-92. TNEB simultaneously ventured into wind generation and 120 units with a total capacity of 19.355 MW was commissioned in the period 1986-93. In 1992, the power sector was thrown open for private participation and the first independent power project was established by GMR Vasavi at Basin Bridge, Chennai. Today TNEB has grown into a giant organization having an installed capacity of 10364 MW of conventional power with 7791 MW of Renewable energy power as on 1st April 2012. The current total installed capacity of Tamil Nadu as on 30th June 2012 was 10,364 MW of conventional power and 7791 MW of renewable energy power. Of the total electricity generation installed capacity, the installed generation capacity of large Hydro accounted to 2223 MW, while thermal generation (State sector) accounts to a total installed capacity of 2970 and share of CGS, 2956 MW.
Renewable Energy 42%
Large Hydro 12%
Figure 9.1: Share of energy mix in the Installed Capacity for electricity generation st in Tamilnadu as of 31 March 2012 Source: Tamil Nadu Electricity Board
The Renewable energy sector accounts to close to 40 percent of the Tamil Nadu Electricity Board’s Grid Capacity, while accounting to over 36 percent of the total installed electricity generation capacity. In terms of actual energy generation, the total electricity generated as on 31.03.2012 in the state was 77,819 Million Units, which includes, 49,877 Million units of purchased electricity which is both the central share of generation units located in Tamil Nadu as well as generation units located outside the state.
Figure 9.2 : Sources of Electricity for the State Source: Tamil Nadu Electricity Board, Statistics at a Glance, 2011-12
As can be seen from the above figures, on an average 55-60 percent of the power requirement of the state is purchased from either the central grid or from the Central Share of electricity generated from plants located in the state. Further, despite a large installed capacity of electricity generation from renewable energy sources, the actual energy generated is fairly low. Thermal generation contributes fairly significantly to the electricity requirement of the state and this is also largely due to a fairly high plant load factor of all the thermal power plants located in the state. As on 31.03.2010, Tamil Nadu had a total of 40 hydro installations, which include the various stages of some hydro such as Sholayar 1 and 2, Kodayar 1 and 2, LMHEP Barrage, 1,2,3 &4 and so on. The total installed capacity of these hydro totalled to 2187 MW and the average Plant Load Factor of all these hydro installation was 27 percent, with the highest PLF being that of Moyar Hydro Electric Plant and Kundah 1 hydro electric plant with 49 percent respectively. The Plant Load factor for wind farms in Tamil Nadu range is between 12.56 percent to 22 percent. In all, Tamil Nadu’s generation units have a fairly high plant load factor, whether it is thermal, hydro or wind. In terms of surplus/deficit power requirement, the state on an average has deficit power of roughly 6.5 percent or approximately 5000 Million Units per year. Table 9.1 below gives an overview of monthly power surplus or deficit for the state of Tamil Nadu for the year 2010-11. This trend has been more or less the same for the last five years. As can be seen from the table, t